22MW battery system will store power from the 76-turbine Pen y Cymoedd wind farm in Wales to help stabilise the grid
Germany's first onshore wind auction since introducing renewable feed-on tariff law reaches average of 5.71 Euro cents per KWh
Vattenfall's Pen y Cymoedd Wind Energy Project promises to deliver enough power for 13 per cent of Welsh households
Major utility says next government must continue to back low-carbon transition and urges action to allow onshore wind to play a "major role" in UK energy